Referring to this link Mini MP3 Player Interfaced with Arduino I would like to know what ADKEY1 and ADKEY2 really does, including their "derivatives" (segment 2 to 4, segment 6 to 14)? Does it mean that when I press any segment button, it will play the corresponding mp3 saved in the SDcard then a…

Does ADKEYs play specific mp3 file and will not play the next mp3 file?

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